I stole this information from Dave W. Writeup on CK5
http://coloradok5.com/forums/showthread.php?t=270253
He also got information from Thirdgen.org to start and I think the origanal was written by Fast355
http://www.thirdgen.org/techboard/tbi/4 ... g-tbi.html
Since I'm wiring one up starting today I figured I post up here the one Dave has added notes to.
dave w
Notes and information on converting to a TBI PCM
I have had multiple people ask about re-pinning their earlier TBI cars/trucks
to use the latest PCM. So here is the result. Information regarding the swap.
PCM Swap/Tuning Notes
8746/6965/7747/299 to 427 Truck PCM (Car showed, Trucks VERY similar)
Old Pin---New Pin-----Color---------Function
A1--------F6----------GRN/WHT------Fuel Pump Relay Control
A3--------F16---------DK GRN/YEL---Charcoal Canister Purge Solenoid *** Not used on 87 GMC W/454***
A4--------E1----------GRY-------------EGR Control
A5--------E6----------BRN/WHT------Service Engine Soon Light
A6--------E15---------PNK/BLK-------Ignition Feed +12VDC
A7--------(1*)--------TAN/BLK-------TCC/Shift Light *** Investigate***
A8--------F9----------ORN-------------Serial Datastream
A9--------A14--------WHT/BLK-------Diagnostic Test
A10-------F13--------BRN-------------Vehicle Speed Signal ***Output Speed not from DRAC set***
A11-------B3---------BLK--------------Sensor Ground
A12-------A1---------BLK/WHT-------ECM Ground 1
B1--------E16--------ORN-------------Battery +12VDC
B2--------B12--------TAN/WHT-------Fuel Pump Signal
B3--------A5---------BLK/RED--------EST Ref Low
B5--------A4---------PPL/WHT--------EST Ref High
B6--------?-----------PPL---------------VATS(2*) *** Not used on 87 GMC W/454***
B7--------(3*)-------BLK---------------Knock Sensor *** Not used on 87 GMC W/454***
B8--------E12--------LT BLUE---------A/C Clutch Signal ***GRN Not LT BLUE 87 GMC W/454***
B10-------E5---------ORN/BLK--------Park/Neutral Switch ***Investigate***
C1--------(4*)-------BLK/PNK---------A.I.R. Converter Solenoid *** Not used on 87 GMC W/454***
C2--------E7---------BRN---------------A.I.R. Port Solenoid (Diverter in trucks) ***Investigate***
C3--------A7---------LT GRN/BLK-----IAC "B" Low ***LT GRN-BLK on 87 GMC W/454*** --- A7 1995 7.4
C4--------A8---------LT GRN/WHT----IAC "B" High ***C4 WHT EST SIGNAL on 87 GMC W/454*** F11 1995 7.4
C5--------A3---------LT BLU/WHT-----IAC "A" High ***C5 LT GRN-WHT on 87 GMC W/454*** --- A8 1995 7.4
C6--------A6---------LT BLU/BLK------IAC "A" Low ***C6 LT BLU-WHT 87 GMC W/454*** --- A3 1995 7.4
C7--------(5*)-------LT BLU------------High Gear Switch (In Auto Trans) ***C7 LT BLU-BLK on 87 GMC W/454*** --- A6 1995 7.4
C8--------(6*)-------LT BLU------------Power Steering Pressure Switch ***Not used on 87 GMC W/454***
C9--------(7*)-------PPL/WHT---------Crank Signal
C10-------B8--------YEL----------------Coolant Temperature Signal
C11-------B13-------LT GRN-----------MAP Signal
C12-------B9--------Tan----------------MAT Signal(8*) *** Not used on 87 GMC W/454*** ***ALSO NOT SHOWN ON DIAGRAMS BELOW***
C13-------A15-------DK BLUE---------TPS Signal
C14-------E14-------GRY---------------5 Volt Reference
C15/D14--A9--------DRK GRN--------Injector "2" Control *** D14 on 87 GMC W/454***
C16------E13--------Orange-----------Battery (Inputed in place of Brake Switchfor TCC to function)
D1-------A2----------BLK/WHT--------ECM Ground 2 *** TAN-WHT on 87 GMC W/454***
D2-------B4----------PPL---------------MAP Sensor Ground
D4-------F11--------WHT--------------EST Signal
D5-------B2---------TAN/BLK---------EST Bypass
D6-------A12--------TAN--------------O2 Sensor Ground
D7-------A10--------PPL---------------02 Sensor Signal
D15/D16--A16-----DK BLUE---------Injector "1" Control ***D16 on 87 GMC W/454***
none ---- F8 -------unknown---------For Power steering switch input. (gregs78cam post 10)
Swap Notes
*** Throttle Kicker Enable disabled***
*** Initiate Integral with Calibration Const. Not Running enabled ***
(1*)= Use E2 for a shift light on a manual transmission or E11 for the TCC onan Automatic
(2*)= Supported by the PCM if optioned in the Prom on an UNKNOWN pin
(3*)= A.) Wire like 1995 P30 Step Van, ESC Module output to B7
(3*)= B.) Wire like 1995 C10 Truck, Bypass ESC (Blue to Brown) and useLate TBI/TPI 305/350 Knock sensor
(4*)= Air injection into converter not used on trucks, but PCM has severalother un-used outputs (Tuning Valve, Idle Kicker)
(5*)= Not Used by PCM (I like to leave the small connector in place and pinin unused wires)
(6*)= Supported by PCM if optioned in the Prom on an UNKNOWN pin(1994-1995 2.2 S10 Wiring Diagram anyone?)
(7*)= Not used by PCM, Remove 3 amp "CRANK" fuse from fuse box andstore in small connector)
(8*)= Supported by the PCM, but functionality will need to be enabled in theProm6965 ONLY- Will have a NC relay that the computer grounds to shut-off theA/C compressor when the engine is heavily loaded. The A/C will work eitherby removing the wire all-togather, or connecting it to pin E3 (A/C Cut-Off orCPI Tuning Valve output)
I would also like to mention that the orange Serial Data wire needs to berelocated from the top row, Pin "E" to the lower row, Pin "M". You will alsoneed to scan the vehicle like a 1993-1995 G-Series Van, C-Series Truck,S-Series Blazer, etc with Auto transmission.
Finally, this is a trick Haulin@$$ taught me, if you have a wideband and arelooking to get real-time AFR put into the datastream, hook the 0-5 volt signalinto pin B16 (Linear EGR pintle position feedback). With some adaption to theALDL Definition being used to decode the reading, you can get an AFR
reading of 10-20:1 or so.
Reply With Quote
Originally Posted by 1leg
Bookmarks